Details of Fort Hood Battle Between Maj. Hasan, Cops Still Murky

More details are being released about the gun battle between Maj. Nidal Malik Hasan and the civilian police officers credited with stopping the Fort Hood massacre, but how exactly the alleged shooter was taken down remains murky.

"When we first approached the scene there was a slight incline we had to go up," Todd said. "She broke to the right and I broke to the left and we both took cover."

"I gave him commands, 'halt, drop your weapon,' and he fired on me," Todd said.

While Munley has been hailed as the hero by Fort Hood authorities, her shots bringing down Hasan even though she had been shot three times herself, a report today in the New York Times suggests it was Todd who got off the shots that felled the alleged shooter.

The Times quoted an unidentified witness who said Hasan shot Munley immediately and while she was on the ground, Todd rounded a corner and shot Hasan while the gunman had paused to put another magazine in the pistol.

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Todd was careful to avoid specifics today on "Good Morning America" and said he could not comment on anything Hasan had said during the exchange.

It was the first time in 25 years, he said, that he's had to use his gun.

"There was really no time to think," he said. "We just relied on our training."

Once Hasan's gun had been secured, Todd said they immediately began life-saving measures on him.

"We can't just sit there and watch him die," he said. "We have to do everything we can to preserve life."

Hasan remains hospitalized at Brooke Army Medical Center in San Antonio where he is reportedly paralyzed.

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Munley told Oprah Winfrey Wednesday that she was taking her time to recover.

"Every day is a progress for me, and things are getting better day by day," she said on Winfrey's talk show. "Emotionally, I'm just hoping that the rest of the officers and the injured and the families of the deceased are healing as well."

Experts Say Information About Hasan's Gun Purchase Was Critical

Investigators have continued to probe all aspects of the shooting. A look into Hasan's modest apartment showed that most everything had been cleaned out, save for a few personal items including a book titled "Dreams and Interpretations."

Sources have told ABC News that in August 2009, Hasan walked into the Guns Galore gun store in Killeen, Texas, and legally purchased the FN Herstal tactical pistol that authorities believe was used in the Fort Hood shooting.

An FBI background check under the National Instant Background Check System was done when Hasan purchased the pistol -- but that information was never shared with the Joint Terrorism Task Force in Washington, which was aware that Hasan had repeatedly contacted a radical imam suspected of having ties to al Qaeda.

The FBI's Joint Terrorism Task Force ran down intelligence leads relating to Hasan late last year but closed the inquiry sometime in early 2009.

"The piece of information about the gun could have been critical," said former FBI Special Agent Brad Garrett. "One of the problems is that the law sometimes restricts you in what you can do."